时效强化高镍Inconel-718合金低周疲劳性能及寿命预测

doi:10.13251/j.issn.0254-6051.2021.07.001

金属热处理 ›› 2021, Vol. 46 ›› Issue (7): 1-6.DOI: 10.13251/j.issn.0254-6051.2021.07.001

• 组织与性能 • 下一篇

时效强化高镍Inconel-718合金低周疲劳性能及寿命预测

屈华鹏¹, 王留兵², 王东辉², 吴冰洁², 冯翰秋¹, 陈海涛¹, 许斌², 宋丹戎², 郎宇平¹

1.钢铁研究总院特殊钢研究所, 北京 100081;
2.中国核动力研究设计院核反应堆系统设计技术重点实验室, 四川成都 610200

收稿日期:2021-01-23 出版日期:2021-07-25 发布日期:2021-12-10
作者简介:屈华鹏(1981—),男,高级工程师,博士,主要研究方向为不锈钢及耐蚀合金材料,E-mail:quhuapeng@nercast.com。
基金资助:
国家重点研发计划(2016YFB0300202)

Low-cycle fatigue properties and life prediction of aging strengthenedhigh-nickel Inconel-718 alloy

Qu Huapeng¹, Wang Liubing², Wang Donghui², Wu Bingjie², Feng Hanqiu¹, Chen Haitao¹, Xu Bin², Song Danrong², Lang Yuping¹

1. Institute of Special Steel, Central Iron and Steel Research Institute, Beijing 100081, China;
2. Science and Technology on Reactor System Design Technology Laboratory, Nuclear power institute of China, Chengdu Sichuan 610200, China

Received:2021-01-23 Online:2021-07-25 Published:2021-12-10

摘要/Abstract

摘要： 研究了核反应堆弹簧材料用时效强化0Cr20Ni55Mo3Nb5Ti(Inconel-718)合金材料在350 ℃高温下的低周疲劳性能,并采用Manson-Coffin和郑修麟模型对加载应变水平和低周疲劳寿命之间关系进行了拟合计算和对比。结果表明:经过970 ℃×1 h空冷+720 ℃×8 h炉冷+620 ℃×8 h空冷热处理后,Inconel-718合金在350 ℃具有优异的低周疲劳性能。根据郑修麟关系式计算结果,其临界应变疲劳极限约为0.37%,在低于此应变水平条件下,其低周疲劳寿命高于10⁷循环。Manson-Coffin模型由于不包含临界应变疲劳极限参数ε₀,导致其对较低应变水平的疲劳寿命预测精度较低。

关键词: 时效强化, 高镍Inconel-718合金, 低周疲劳, 疲劳寿命预测

Abstract: High-temperature low-cycle fatigue properties at 350 ℃ of the aging-strengthened 0Cr20Ni55Mo3Nb5Ti (Inconel-718) alloy was researched. The relationship between strain level and fatigue life was calculated and compared based on Manson-Coffin and Zheng models. The test results show that excellent low-cycle properties are obtained in Inconel-718 alloy after 970 ℃×1 h, AC+720 ℃×8 h, FC+620 ℃×8 h, AC heat treatment. According to Zheng model, the critical strain limit is approximately 0.37%. The fatigue life is longer than 10⁷ with strain levels lower than 0.37%. Without critical strain limit parameter ε₀, the fatigue life prediction accuracy of Manson-Coffin model is relatively lower, especially at low loaded strain condition.

Key words: aging strengthening, high-nickel Inconel-718 alloy, low-cycle fatigue, fatigue life prediction

中图分类号:

TG156.2

屈华鹏, 王留兵, 王东辉, 吴冰洁, 冯翰秋, 陈海涛, 许斌, 宋丹戎, 郎宇平. 时效强化高镍Inconel-718合金低周疲劳性能及寿命预测[J]. 金属热处理, 2021, 46(7): 1-6.

Qu Huapeng, Wang Liubing, Wang Donghui, Wu Bingjie, Feng Hanqiu, Chen Haitao, Xu Bin, Song Danrong, Lang Yuping. Low-cycle fatigue properties and life prediction of aging strengthenedhigh-nickel Inconel-718 alloy[J]. Heat Treatment of Metals, 2021, 46(7): 1-6.

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时效强化高镍Inconel-718合金低周疲劳性能及寿命预测

Low-cycle fatigue properties and life prediction of aging strengthenedhigh-nickel Inconel-718 alloy

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